Law Of Thermodynamics Quiz Questions

54 Questions | Total Attempts: 69

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Thermodynamics Quizzes & Trivia

There are four known laws of thermodynamics and the first one is the law of conservation of energy, which states that energy can neither be created nor destroyed. The quiz below covers how well you understand the different laws of thermodynamics and how to apply them in everyday life. All the best!


Questions and Answers
  • 1. 
    Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?
    • A. 

      Anabolism

    • B. 

      Dehydration

    • C. 

      Metabolism

    • D. 

      Catabolism

    • E. 

      Catalysis

  • 2. 
    Which of the following is (are) true for anabolic pathways?
    • A. 

      They consume energy to build up polymers from monomers.

    • B. 

      They do not depend on enzymes.

    • C. 

      They are usually highly spontaneous chemical reactions.

    • D. 

      They release energy as they degrade polymers to monomers.

  • 3. 
    Which of the following is a statement of the first law of thermodynamics?
    • A. 

      Energy cannot be transferred or transformed.

    • B. 

      The entropy of the universe is decreasing.

    • C. 

      Kinetic energy is stored energy that results from the specific arrangement of matter.

    • D. 

      The entropy of the universe is constant.

    • E. 

      Energy cannot be created nor destroyed

  • 4. 
    For living organisms, which of the following is an important consequence of the first law of thermodynamics?
    • A. 

      The organism ultimately must obtain all of the necessary energy for life from its environment.

    • B. 

      Organisms are unable to transform energy.

    • C. 

      The entropy of an organism decreases with time as the organism grows in complexity.

    • D. 

      The energy content of an organism is constant.

    • E. 

      Life does not obey the first law of thermodynamics.

  • 5. 
    Living organisms increase in complexity as they grow, resulting in a decrease in the entropy of an organism. How does this relate to the second law of thermodynamics?
    • A. 

      Life obeys the second law of thermodynamics because the decrease in entropy as the

    • B. 

      Living organisms are able to transform energy into entropy.

    • C. 

      As a consequence of growing, organisms create more disorder in their environment than the

    • D. 

      Living organisms do not obey the second law of thermodynamics, which states that entropy

    • E. 

      Living organisms do not follow the laws of thermodynamics.

  • 6. 
    Whenever energy is transformed, there is always an increase in the
    • A. 

      Enthalpy of the universe

    • B. 

      Free energy of the system

    • C. 

      Free energy of the universe

    • D. 

      Entropy of the universe

    • E. 

      Entropy of the system

  • 7. 
    Which of the following statements is a logical consequence of the second law of thermodynamics?
    • A. 

      Every chemical reaction must increase the total entropy of the universe.

    • B. 

      If there is an increase in the energy of a system, there must be a corresponding decrease in the

    • C. 

      Energy can be transferred or transformed, but it cannot be created or destroyed.

    • D. 

      If the entropy of a system increases, there must be a corresponding decrease in the entropy of

    • E. 

      Every energy transfer requires activation energy from the environment.

  • 8. 
    Which of the following statements is representative of the second law of thermodynamics?
    • A. 

      Heat represents a form of energy that can be used by most organisms to do work.

    • B. 

      Every energy transformation by a cell decreases the entropy of the universe.

    • C. 

      Without an input of energy, organisms would tend toward decreasing entropy.

    • D. 

      Cells require a constant input of energy to maintain their high level of organisation.

    • E. 

      Conversion of energy from one form to another is always accompanied by some gain of free

  • 9. 
    Which of the following types of reactions would decrease the entropy within a cell?
    • A. 

      Hydrolysis

    • B. 

      Respiration

    • C. 

      Dehydation reaction

    • D. 

      Catabolism

    • E. 

      Digestion

  • 10. 
    The organisation of organisms has become increasingly complex with time. This statement
    • A. 

      Requires that due to evolution, the entropy of the universe increased.

    • B. 

      Is based on the fact that organisms function as closed systems.

    • C. 

      Is consistent with the second law of thermodynamics.

    • D. 

      A and B only

    • E. 

      A, B and C

  • 11. 
    Which of the following is an example of potential rather than kinetic energy?
    • A. 

      A firefly using light flashes to attract a mate

    • B. 

      Boy mowing grass

    • C. 

      A food molecule made up of energy-rich macromolecules

    • D. 

      Water rushing over Niagara Falls

    • E. 

      An insect foraging for food

  • 12. 
    Which of the following is considered an open system?
    • A. 

      A sealed terrarium

    • B. 

      Food cooking in a pressure cooker

    • C. 

      An organism

    • D. 

      Liquid in a corked bottle

  • 13. 
    Which of the following is true of metabolism in its entirety?
    • A. 

      Metabolism is a property of organismal life

    • B. 

      Metabolism depends on an organism's adequate hydration

    • C. 

      Metabolism manages the increase of entropy in an organism

    • D. 

      Metabolism utilises all of an organism's resources

    • E. 

      Metabolism depends on a constant supply of energy from food

  • 14. 
    Which of the following best describes the change in free energy in a system at chemical equilibrium?
    • A. 

      Slightly decreasing

    • B. 

      Greatly increasing

    • C. 

      Slightly increasing

    • D. 

      Greatly decreasing

    • E. 

      No change

  • 15. 
    Which of the following is true for all exergonic reactions?
    • A. 

      The reaction proceeds with a net release of free energy.

    • B. 

      The products have more total energy than the reactants.

    • C. 

      Some reactants will be converted to products.

    • D. 

      The reactions are nonspontaneous.

    • E. 

      A net input of energy from the surroundings is required for the reactions to proceed.

  • 16. 
    Chemical equilibrium is relatively rare in living cells. Which of the following could be an example of a reaction at chemical equilibrium in a cell?
    • A. 

      A chemical reaction in which the entropy change in the reaction is just balanced by an

    • B. 

      A reaction in which the free energy at equilibrium is higher than the energy content at any

    • C. 

      An endergonic reaction in an active metabolic pathway where the energy for that reaction is

    • D. 

      A chemical reaction in which both the reactants and products are only used in a metabolic

    • E. 

      There is no possibility of having chemical equilibrium in any living cell.

  • 17. 
    A chemical reaction that has a positive 􀁐G is correctly described as
    • A. 

      Endothermic

    • B. 

      Enthalpic

    • C. 

      Spontaneous

    • D. 

      Endergonic

    • E. 

      Exothermic

  • 18. 
    Which of the following best describes enthalpy (H)?
    • A. 

      The system's entropy

    • B. 

      The condition of a cell that is not able to react

    • C. 

      The cell's energy equilibrium

    • D. 

      The heat content of a chemical system

    • E. 

      The total kinetic energy of a system

  • 19. 
    Why is ATP an important molecule in metabolism?
    • A. 

      It provides energy coupling between exergonic and endergonic reactions.

    • B. 

      Its terminal phosphate group contains a strong covalent bond that when hydrolysed releases

    • C. 

      Its terminal phosphate bond has higher energy than the other two.

    • D. 

      Its hydrolysis provides an input of free energy for exergonic reactions.

    • E. 

      All of the above are true.

  • 20. 
    When 10,000 molecules of ATP are hydrolyxed to ADP and Pi in a test tube, about twice as much heat is liberated as when a cell hydrolyses the same amount of ATP. Which of the following is the best explanation for this observation?
    • A. 

      Reactant and product concentrations are not the same

    • B. 

      Cells are open systems, but a test tube is a closed system.

    • C. 

      The hydrolysis of ATP in a cell produces different chemical products than does the reaction in

    • D. 

      The reaction in cells must be catalysed by enzymes, but the reaction in a test tube does not

    • E. 

      Cells are less efficient at heat production than nonliving systems.

  • 21. 
    Which of the following is most similar in structure to ATP?
    • A. 

      A phosophilip

    • B. 

      An RNA nucleotide

    • C. 

      An amino acid with three phosphate groups

    • D. 

      A DNA helix

    • E. 

      An anabolic steroid

  • 22. 
    What term is used to describe the transfer of free energy from catabolic pathways to anabolic pathways?
    • A. 

      Feedback regulation

    • B. 

      Entropy

    • C. 

      Bioenergetics

    • D. 

      Cooperativity

    • E. 

      Energy coupling

  • 23. 
    Which of the following statements is true concerning catabolic pathways?
    • A. 

      They build up complex molecules such as protein from simpler compounds.

    • B. 

      They combine molecules into more energy-rich molecules.

    • C. 

      They are usually coupled with anabolic pathways to which they supply energy in the form of

    • D. 

      They are endergonic.

    • E. 

      They are spontaneous and do not need enzyme catalysis.

  • 24. 
    When chemical, transport, or mechanical work is done by an organism, what happens to the heat generated?
    • A. 

      It is lost to the environment.

    • B. 

      It is used to generate ADP from nucleotide precursors.

    • C. 

      It is used to store energy as more ATP.

    • D. 

      It is transported to specific organs such as the brain.

    • E. 

      It is used to power yet more cellular work.

  • 25. 
    When ATP releases some energy, it also releases inorganic phosphate. What purpose does this serve (if any) in the cell?
    • A. 

      It can be added to water and excreted as a liquid.

    • B. 

      It can only be used to regenerate more ATP.

    • C. 

      It can enter the nucleus to affect gene expression.

    • D. 

      It can be added to other molecules in order to activate them.

    • E. 

      It is released as an excretory waste.

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